Me again.
My WCS keeps scoring goals at any moment.
Just like that, for no reason, and while the ball is in a totally different place.

I've tried fiddling with that ribbon cable, and the other cables on the CPU board.
Also cleaning connectors.
But nothing changed.

I'm in search of leads, right now...

Any idea??

Yup,
I think i'll have to check everything bit by bit...

What do you mean by 'tabs'?

Thanks a bunch, fatality83 !
I found the problem, and just in case anyone would be in this situation one day and looks for the solution round here, well...
The issue was the goal opto. The led that emits (the white one) had a broken leg. I guess it stopped emitting from time to time, and the machine considered the beam was cut...

I had to go go to the junk yard and find a TV remote for the led.
I did find one, but i also bumped my head into a metal plate, opened my scalp, ended un with blood all over my face and now a nice wound on my forehead that will forever be connected to that pinball machine...

All this for a tiny led leg.